Harlequin ducks roost on river boulder in raging water in pairs of male and female. Wild birds use the rapid habitat to deliver food for them. Diving for food in the current.

United States: 1950s: Man does experiment in lab. Man collects energy from sun on his machine. Lady cooking food using solar energy. Boats travelling along water. Wheel spinning as it converts energy from heat. Two men talk to cartoons on screen.

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Ducks Looking for Food in Wetland with Blue Waters, 4K

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1957: a group of fish fighting over food floating on the water NETHERLANDS